{{ site.name }} will allow you to jump around symbol definitions even across files with just a click. To "Jump to Symbol Declaration" use Control+Command+Alt+Up (or Alt+Click on Windows, Command+Click on Linux or Control+Click on Mac OS X) over the symbol, and Control+Command+alt+Left for going back.

Start typing code as usual, autocomplete will pop up whenever it's available. To trigger manual codeintel autocompletion use Shift+Control+Space (Shift+Command+Space on Mac OS X).

DON'T DESPAIR! The first time you use it it needs to build some indexes and it can take more than a few seconds (around six in my configuration).

It just works!